US20030049809A1 - Method of inactivating microorganisms in a fluid using ultraviolet radiation - Google Patents

Method of inactivating microorganisms in a fluid using ultraviolet radiation Download PDF

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US20030049809A1
US20030049809A1 US10/196,020 US19602002A US2003049809A1 US 20030049809 A1 US20030049809 A1 US 20030049809A1 US 19602002 A US19602002 A US 19602002A US 2003049809 A1 US2003049809 A1 US 2003049809A1
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fluid
reaction chamber
lamp
reactor
flow
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Klaus Kaiser
Hans-Juergen Henzler
Joerg Kauling
Rolf Treckmann
Kathryn Remington
Cynthia Galloway
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Bayer Healthcare LLC
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Klaus Kaiser
Hans-Juergen Henzler
Joerg Kauling
Rolf Treckmann
Kathryn Remington
Galloway Cynthia J.
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Application filed by Klaus Kaiser, Hans-Juergen Henzler, Joerg Kauling, Rolf Treckmann, Kathryn Remington, Galloway Cynthia J. filed Critical Klaus Kaiser
Priority to US10/196,020 priority Critical patent/US20030049809A1/en
Publication of US20030049809A1 publication Critical patent/US20030049809A1/en
Assigned to BAYER HEALTHCARE LLC reassignment BAYER HEALTHCARE LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GALLOWAY, CYNTHIA J., TRECKMANN, ROLF, REMINGTON, KATHRYN M.
Priority to US11/079,934 priority patent/US7695675B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
    • B01J19/122—Incoherent waves
    • B01J19/123—Ultra-violet light
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/26—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
    • A23L3/28—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating with ultraviolet light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K41/00—Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
    • A61K41/10—Inactivation or decontamination of a medicinal preparation prior to administration to an animal or a person
    • A61K41/17—Inactivation or decontamination of a medicinal preparation prior to administration to an animal or a person by ultraviolet [UV] or infrared [IR] light, X-rays or gamma rays
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
    • A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/08—Radiation
    • A61L2/10—Ultra-violet radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
    • A61M1/3681—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits by irradiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
    • A61M1/3681—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits by irradiation
    • A61M1/3683—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits by irradiation using photoactive agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B01J19/2405—Stationary reactors without moving elements inside provoking a turbulent flow of the reactants, such as in cyclones, or having a high Reynolds-number
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C02F1/325—Irradiation devices or lamp constructions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/05—General characteristics of the apparatus combined with other kinds of therapy
    • A61M2205/051—General characteristics of the apparatus combined with other kinds of therapy with radiation therapy
    • A61M2205/053—General characteristics of the apparatus combined with other kinds of therapy with radiation therapy ultraviolet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00139—Controlling the temperature using electromagnetic heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00164—Controlling or regulating processes controlling the flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00168—Controlling or regulating processes controlling the viscosity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3223—Single elongated lamp located on the central axis of a turbular reactor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/328—Having flow diverters (baffles)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S422/00—Chemical apparatus and process disinfecting, deodorizing, preserving, or sterilizing
    • Y10S422/905—Miscellaneous liquid sterilization means

Definitions

  • the present invention relates generally to the sterilization of fluids such as biological fluids to inactivate undesired microorganisms such as viruses in the fluids. More specifically, the invention relates to sterilization of fluids by means of controlled ultraviolet irradiation.
  • Sterilization of fluids is an essential step in the manufacture of many pharmaceutical products and foodstuffs. Its goal is the reliable elimination of microorganisms, including viruses, while preserving, as intact as possible, the desirable components of the products. Sterilization may be required of biological fluids, such as nutrient media for fermentation, various blood products, and fluids bearing active pharmaceutical proteins. In the food industry, sterilization of fluid such as milk products is common.
  • UV light has been employed as a method for inactivating undesirable microorganisms.
  • Irradiating plasma and blood products, for example, with UV-light to inactivate viruses was known during WW II.
  • UV-treatment of blood derivatives is especially useful for treating uncoated, heat-stable viruses.
  • Chin et al., Photochem. & Photobiol. 65, 432-435 (1997) teaches that irradiation of plasma products with UV-light leads to inactivation of the hepatitis A virus and parvoviruses.
  • UV-irradiation may inactivate microorganisms and/or viruses by generating mutagenic alteration of their genetic material. Above a minimum dose of radiation, the microorganisms lose their reproductive capacity. UV-irradiation damages nucleic acid by creating intrastrand nicks and inducing nucleotide photodimerization, both of which disrupt nucleic acid replication. Through such mechanisms, UV-irradiation can be an effective means of inactivating undesirable microorganisms within biological and other fluids.
  • UV-irradiation techniques controlling the irradiation of a fluid so as to ensure sufficient radiation exposure to inactivate undesirable microorganisms within a fluid while at the same time minimizing or eliminating UV-radiation damage to desirable proteins and other components within the fluid.
  • a UV reactor includes a source of UV radiation such as, for example, one or more elongated tubular bulbs or lamps.
  • a source of UV radiation such as, for example, one or more elongated tubular bulbs or lamps.
  • an annular reaction chamber with a predetermined width is formed around and encloses the lamp and fluid to be irradiated is pumped or otherwise moved through the chamber, where it is exposed to UV light from the lamp.
  • a UV source or sources may surround and radiate inwardly into a central tubular reaction chamber. In either case, flow rate, light intensity, chamber width or diameter, and reactor length are selected for a particular fluid to ensure, as much as possible, the most effective UV radiation dosage for deactivating undesirable microorganisms while conserving the viability of the desirable components of the fluid.
  • a problem with the use of UV reactors for irradiating fluid with ultraviolet light results from the finite width of the reaction chamber and the laminar nature of the fluid flow along the chamber. More specifically, as the fluid flows along the chamber, the UV radiation intensity in the treated fluid decreases relatively rapidly as a function of distance from the radiation source. This is due to many factors including the natural inverse-square law of radiation intensity as a function of distance from a source and the absorption characteristics of the fluid and the proteinaceous material supporting the infectious particles. In any event, microorganisms and viruses within layers of the fluid that flow along the outside of the reaction chamber farther from the radiation source receive no or a reduced dosage of radiation. These microorganisms are, therefore, inactivated slowly or not at all.
  • microorganisms in layers of fluid that flow along the inside of the reaction chamber closest to the radiation source receive increased dosages, and in many cases overdoses, of radiation, which, in some cases, is high enough to cause significant damage to desirable proteins and other components in these layers of the fluid.
  • the result is unpredictable and inefficient sterilization and higher levels of damage to desirable components.
  • a further limitation of and problem with traditional UV-irradiation reactors is the unfavorable flow profile and dynamic conditions of fluid films when in laminar flow along the radiation source. More specifically, in a laminar flow there is no or very little fluid exchange normal to the flow direction. Thus, as mentioned above, fluid layers farther from the source receive a smaller radiation dose than fluid layers close to the source. Furthermore, the flow velocity profile within a confined laminar flow is such that the flow velocity is relatively low adjacent to the walls of the reaction chamber and is substantially higher intermediate the walls. Thus, fluid closest to the wall of the reaction chamber adjacent the light source flows more slowly and is exposed to the UV radiation substantially longer than fluid between the walls of the reaction chamber.
  • the average residence time of the fluid in the reactor must be increased. This leads, however, to increased radiation dosage in the slower moving boundary layers of the fluid flow and consequent increased probability of undesired damage to desirable components in these layers. Thus, destruction of desirable components in the boundary layers due to overexposure is virtually inevitable.
  • Clark et al. in U.S. Pat. No. 5,786,598 discloses high intensity pulses of short wavelength light to deactivate microorganisms.
  • Morgalis-Nunno et al., U.S. Pat. No. 6,087,141 discloses the use of light in the wavelength range of 340-400 nm (UVA) rather than short wavelengths of about 280 nm or less. Protection of the desired functionality of the fluid is afforded by adding a free-radical scavenger in the form of psoralen.
  • Morowitz et al., U.S. Pat. No. 5,981,163 teaches the addition of quenching protective agents during irradiation deactivation of viruses. While such techniques attempt to deal with the free-radicals generated in the fluid, none address the problems, such as overexposure, that result in the formation of such free-radicals in the first place.
  • the tangential inflow solution has proven problematic in that the fluid flow through the reaction chamber rapidly reverts, due to wall friction and other hydrodynamic factors, to a fully axial and laminar profile directed along the longitudinal axis of the chamber.
  • the Dean vortices which are theoretically postulated at least for the area of tangential inflow, and which are intended to promote cross-exchange of the reaction medium within the reaction chamber, are surprisingly not present according to visual studies and CFD-investigations (flow simulation). Tangential entry ring-slot reactors, therefore, afford only a limited solution to the problems discussed above.
  • the present invention is a method of inactivating microorganisms such as viruses suspended in a fluid by irradiating the fluid with UV light.
  • the method can be applied to the sterilization of biological products and foodstuffs, including, but not limited to, blood components, fermentation media from recombinant technology, milk and milk products, drinking water, fruit juices and other beverages like soft drinks, chemical and pharmaceutical products, virus vaccines, genetically produced drugs and proteins, drugs and proteins from transgenic animals and plants, and blood plasma and products from blood plasma.
  • UV exposure is achieved in a generally tubular reactor wherein the fluid flows through a reaction chamber that surrounds an elongated tubular UV light source.
  • the method comprises the steps of establishing a primary flow of the fluid in a first direction along the radiating surface of a UV light source and superimposing on the primary flow a circulating secondary flow of the fluid.
  • the secondary flow circulates in a direction substantially transverse to the radiating surface of the UV source such that the entire volume of the fluid circulates repeatedly toward and away from the UV source as the primary flow carries it along the length of the source.
  • the reaction chamber in a reactor for carrying out the method of the present invention may be much wider than an effective “kill zone” immediately adjacent the radiating surface of the UV light source wherein the intensity of the radiation is always above the inactivation threshold.
  • the average residence time of the fluid in the kill zone and thus the radiation dosage received is a function, among other things, of the thickness of the kill zone in the particular fluid being treated, the intensity of the UV light source, and the characteristics of the primary and secondary flows.
  • these parameters can be controlled as needed, according to the invention, to establish and maintain an average kill zone residence time for the entire volume of fluid that corresponds to a predetermined required dosage of UV radiation.
  • the reaction chamber can be much wider than in thin-film reactors, reasonably sized high volume reactors that are scalable to commercial production throughputs are possible.
  • the average radiation dosage received by all of the fluid is constant, i.e. no portions or layers of the fluid are overexposed and none are underexposed, the formation of free-radicals common in prior art UV reactors is virtually eliminated.
  • the method of the invention can be used to sterilize biological or other fluids without the need to use free-radical scavengers.
  • the methodology of the invention including the establishment and maintenance of a circulating secondary flow superimposed on a primary flow, can be realized through a variety of reactor and reaction chamber configurations. Several such configurations are discussed in some depth in the detailed description set forth. It will be understood, however, that the method of the invention might well be carried out by other reactor designs and configurations, but that the essence of the methodology of the invention is substantially the same. Regardless of the design of the apparatus for establishing and maintaining the conditions of the invention, the method has been demonstrated to provide controllable and predictable inactivation with minimum damage to desirable components, without the need for free-radical scavengers, and with the potential for commercially viable throughput. Additional objects, features, and advantages of the invention will become more apparent upon review of the detailed description set forth below when taken in conjunction with the accompanying drawing figures, which are briefly described as follows.
  • FIG. 1 is a simplified schematic representation of a typical ring-slot UV reactor illustrating the characteristics of a laminar fluid flow.
  • FIG. 2 a simplified cross-sectional view of a portion of a UV reactor illustrating fundamental principles of the present invention.
  • FIGS. 3 through 7 are sectional views illustrating one embodiment of a UV reactor with rotating agitator usable for carrying out the methodology of the present invention.
  • FIGS. 8 and 9 are sectional views illustrating an alternate embodiment of a UV reactor usable for carrying out the methodology of the present invention.
  • FIGS. 10 and 11 are sectional views illustrating another alternate embodiment of a UV reactor usable for carrying out the methodology of the present invention.
  • FIGS. 12 and 13 are sectional views illustrating still another alternate embodiment of a UV reactor usable for carrying out the methodology of the present invention.
  • FIGS. 14 and 15 are sectional views illustrating still another alternate embodiment of a UV reactor usable for carrying out the methodology of the present invention.
  • FIGS. 16 and 17 are sectional views illustrating yet another alternate embodiment of a UV reactor usable for carrying out the methodology of the present invention.
  • FIG. 18 presents two graphs showing ⁇ 1 PI potency and porcine parvovirus (PPV) reduction as a function of fluency at various ⁇ 1 PI concentrations and illustrates the determination of critical parameters in accessing UV sterilization methodologies.
  • FIG. 19 is a graph showing PPV reduction in a solution of 5 mg/ml of ⁇ 1 PI proteinase inhibitor as a function of time and illustrates the results of a UVC inactivation of IVIG experiment applying the methodology of the present invention.
  • FIG. 20 is a graph of PPV reduction in a solution of 5 mg/ml of ⁇ 1 PI proteinase inhibitor and percent ⁇ 1 PI activity as a function of fluency and illustrates the results of another UVC inactivation experiment applying the methodology of the present invention.
  • FIG. 21 is a graph of PPV reduction in a solution of 5 mg/ml of ⁇ 1 PI proteinase inhibitor and percent ⁇ 1 PI activity as a function of fluency and illustrates the results of yet another UVC inactivation experiment applying the methodology of the present invention.
  • FIG. 1 illustrates general principles of fluid flow through a traditional prior art tubular or ring-slot UV reactor and the problems and shortcomings associated therewith.
  • the reactor 11 which is shown in simplified schematic form for clarity, includes an ultraviolet radiation source in the form of a centrally disposed elongated tubular UV lamp 12 .
  • the UV lamp 12 is surrounded by a cylindrical housing 13 having an outer wall 14 and an inner wall 16 , which bound and define an annular or ring shaped reaction chamber 17 surrounding the lamp 12 .
  • the inner wall 16 of the housing is transparent to ultraviolet radiation such that UV light from the lamp 12 radiates into the reaction chamber 17 .
  • the reaction chamber 17 has a predetermined width defined by the distance between its outer and inner walls 14 and 16 respectively.
  • a fluid inlet port 18 communicates with the reaction chamber 17 at one end, the bottom end in FIG. 1, and a fluid outlet port communicates with the reaction chamber 17 at the opposite end, the top end in FIG. 1.
  • Fluid to be sterilized is pumped or otherwise fed to the fluid inlet port 18 and flows upwardly through the reaction chamber 17 and along the length of the UV lamp as indicated by arrows 21 before exiting the reaction chamber through fluid outlet port 19 .
  • the fluid moves through the reaction chamber, it is exposed to UV radiation from the UV lamp 12 , which acts to sterilize the fluid by inactivating undesirable components in the fluid.
  • the UV radiation theoretically inactivates or “kills” the virus particles within the fluid as the fluid flows through the reaction chamber.
  • FIG. 1 depicts in more detail the fluid flow pattern through the reaction chamber 17 and its relationship to the UV radiation intensity profile in the chamber and also illustrates a fundamental cause of problems with prior art reactors and UV inactivation techniques. More specifically, the fluid moves through the reaction chamber and along the length of the UV lamp 12 in a substantially laminar flow, meaning that there is little if any fluid movement in a direction transverse to the lamp. In other words, fluid layers within the reaction chamber tend to retain their relative distances from the UV lamp as the fluid moves along the entire length of the chamber. Thus, fluid layers near the outer wall 14 tend to stay near the outer wall and fluid layers near the inner wall 16 tend to stay near the inner wall.
  • the boundary layers of fluid near the inner and outer walls of the chamber move more slowly than fluid layers intermediate the walls, as illustrated by the velocity profile arrows 21 in FIG. 1.
  • the residence time in the reaction chamber of fluid in the boundary layers is greater than the residence time of fluid in intermediate layers of the flow.
  • Curve 22 represents the radiation or light intensity within the reaction chamber 17 as a function of distance from the UV lamp 12 .
  • the initial intensity immediately adjacent the UV lamp is relatively high and essentially is the inherent surface intensity of the lamp itself.
  • the light intensity falls off rapidly as a function of distance from the lamp due to a variety of factors including the natural inverse square law of radiation intensity and the light absorption characteristics of the fluid.
  • the light intensity is equal to a “critical” intensity, below which UV radiation levels are insufficient to inactivate viruses within the fluid. This critical distance defines the outer boundary of a “kill zone” 24 within which viral inactivation occurs and outside of which viruses within the fluid are substantially unaffected by the UV radiation.
  • FIG. 2 illustrates, in simplified schematic form, the unique methodology of the present invention for addressing and eliminating the problems that plague prior art UV reactors, including thin-film reactors.
  • the invention is illustrated in FIG. 2 within the context of a simplified UV reactor 31 having an axially extending UV lamp 32 adapted to radiate ultraviolet radiation in a predetermined frequency band.
  • the lamp 32 radiates UVC radiation; that is, radiation having a wavelength between about 180 and 320 nm, or more preferably between about 225 and 290 nm, and most preferably about 254 nm.
  • UVC radiation is preferred because it tends to cause less detrimental effects on desirable components such as proteins within a fluid being treated while retaining sufficient energy to inactivate viruses and other target microorganisms within the fluid.
  • other types of UV radiation such as, for example, UVA and UVB are contemplated and are within the scope of the invention.
  • the UV lamp 32 is disposed along the central axis of a generally tubular housing 33 having an outer wall 34 and an inner wall 36 that bound and define an elongated annular reaction chamber 37 .
  • the inner wall 36 of the housing is transparent to UV radiation so that UV light from the lamp 32 radiates into the chamber 37 .
  • a fluid, such as a biological fluid, to be treated is pumped or otherwise moved through the annular reaction chamber 37 by an appropriate pump (not shown) so that the fluid progresses (in the embodiment of FIG. 1) from the bottom of the reaction chamber toward the top of the reaction chamber, where it exits the chamber through an outlet port (not shown).
  • the fluid moves through the reaction chamber 37 and along the length of the UV lamp 32 , it is irradiated with UV radiation from the UV source to inactivate microorganisms such as viruses contained within the fluid.
  • an inactivation or kill zone 38 is defined along the inner wall 36 of the reaction chamber.
  • the width of the kill zone is determined by many factors including the intensity of the lamp, the composition and optical characteristics of the fluid, and others; but generally represents the zone within which the intensity of UV radiation is above a threshold required to affect inactivation of microorganisms within the fluid. Outside the kill zone 38 , the radiation intensity generally is to low to affect inactivation and this is the phenomenon that in the past has led to the development of thin-film reactors as discussed above.
  • the fluid to be treated is moved in a primary flow 39 along the length of the reaction chamber 37 and thus along the surface of the UV lamp 32 as expected.
  • a circulating secondary flow 41 is established within the fluid and is superimposed on the primary flow 39 .
  • the circulating secondary flow 41 preferably is generally radially or transversely relative to the surface of the UV lamp.
  • the fluid moves repeatedly from a region in the reaction chamber outside the kill zone 38 , into and through the kill zone 38 to the inner wall 36 of the reaction chamber, and thence away from the inner wall, back through the kill zone, and back into the region outside the kill zone.
  • a droplet or particle of fluid entrained within the fluid flowing through the reaction chamber may contain undesirable microorganisms such as viruses as well as desirable components such as proteins.
  • the droplet moves generally along the length of the reaction chamber in the direction of the primary flow 39 , it also circulates repeatedly with the superimposed secondary flow first across the border of the kill zone where it receives the threshold radiation intensity, then through the kill zone 38 where it receives progressively increasing radiation intensity until it reaches the inner wall 37 of the reaction chamber, where it receives the maximum radiation intensity. From the inner wall, the imaginary droplet continues to move with the secondary flow away from the inner wall 36 and back through the kill zone 38 , receiving progressively less radiation intensity, until it moves out of the kill zone and into the inactive region of the reaction chamber outside the kill zone.
  • the imaginary droplet of fluid experiences an average intensity or dosage of UV radiation that is greater than the threshold intensity at the boundary of the kill zone 38 and less than the maximum intensity at the inner wall 36 of the kill zone.
  • the total radiation “seen” by the droplet during its residence in the reaction chamber is therefore approximately equal to the average radiation experienced in each cycle times the number of repetitive cycles within the circulating secondary flow 41 .
  • the beneficial result is that each droplet of the fluid, or, in other words, the entire volume of fluid, experiences a constant average dosage of UV radiation as it moves through the reaction chamber.
  • the dosage itself can be controlled relatively easily by controlling the intensity of the UV lamp 32 , which effects the width of the kill zone, and the characteristics of the primary flow 39 and the superimposed circulating secondary flow 41 . Therefore, not only is the entire fluid exposed to a constant average dosage of radiation, but the dosage is controllable and may be adjusted to achieve optimum inactivation of undesirable microorganisms while preserving as intact as possible the desirable components within the fluid.
  • the reaction chamber in a reactor for carrying out the invention may be significantly wider than the thickness of the kill zone itself, making such a reactor easily scalable to commercial production throughput while maintaining a reactor of reasonable size. It will thus be seen that the present invention offers many significant advantages over prior art UV inactivation methods and devices.
  • FIGS. 3 through 5 illustrate a rotating agitator reactor usable for carrying out the method of the invention.
  • the reactor includes an axially disposed elongated UV lamp 46 disposed within a glass mantle or inner housing 47 .
  • a tubular housing 48 surrounds the glass mantle 47 and a reaction chamber 49 through which fluid may flow is defined between the inner wall of the tubular housing and the glass mantle.
  • the housing is capped and sealed at its top end by a head cover 64 and associated O-rings 62 and at its bottom end with a base cover 52 and associated O-rings 62 .
  • An inlet port 59 communicates with the bottom portion of the reaction chamber 49 for introduction of fluid into the reaction chamber and an outlet port 61 communicates with the top portion of the reaction chamber for egress of fluid therefrom.
  • a rotatable anchor agitator 51 is disposed within the reaction chamber surrounding the glass mantle 47 and is formed with from about 4 to about 10, and preferably about 8, vanes that surround the glass mantle 47 .
  • the anchor agitator 51 is rotatably journaled at its top end in a sleeve bearing 65 and is rotatable supported and centered at its bottom end on an agitator shaft 54 that terminates in a tapered centering tip 53 .
  • the centering tip 53 sits and rides in an appropriately shaped depression in the bottom of the base cover 52 so that the anchor agitator is rotatable about the glass mantle 47 in such a way that its vanes repeatedly circle the glass mantle within the reaction chamber 49 .
  • a diametrically extending magnetic coupler arm 57 is attached to the agitator shaft and is adapted to couple magnetically with the magnetic coupler of a magnetic drive 58 . It will be appreciated that activation of the magnetic drive 58 causes the anchor agitator 51 to rotate within the reaction chamber 49 .
  • a centering pin 56 depends from the bottom of the glass mantle 47 and is disposed in a corresponding seat in the bottom 55 of the anchor agitator 51 to keep the mantle centered with respect to the anchor agitator and to maintain the relatively small clearance between the vanes of the agitator and the surface of the glass mantle.
  • an array of inwardly projecting flow breakers 63 are disposed around the inner wall of the housing 48 .
  • FIG. 4 illustrates use of the reactor 44 to carry out the methodology of the present invention.
  • Fluid to be irradiated is pumped through the inlet port 59 and exits out the outlet port 61 establishing a primary flow 66 along the length of the UV lamp 46 .
  • the anchor agitator 51 is rotated to move its vanes around the glass mantle 47 .
  • the movement of the agitator establishes a circulating secondary flow 67 of fluid that has a major component oriented in a direction transverse to the UV lamp 47 .
  • the flow breakers 63 have been shown to weaken the tendency of the secondary flow to establish tangential components in favor of a more transverse or radial flow direction.
  • the fluid moves repeatedly toward and away from the UV source in the circulating secondary flows 67 as it progresses along the length of the reaction chamber with the primary flow to realize the benefits of the invention as discussed above.
  • Agitator rotation rate, lamp intensity, and flow rate are all adjustable to obtain optimum irradiation for a given fluid being treated in the reactor.
  • FIGS. 6 and 7 illustrate an alternative drive mechanism for the anchor agitator of FIGS. 3 through 5.
  • the sealless drive mechanism 71 includes a drive housing 70 defining an internal cylindrical impeller chamber 75 and an outer annular channel 78 .
  • An array of tangentially oriented slots 77 communicate between the outer channel 78 and the impeller chamber 75 .
  • An inlet port 73 communicates with the outer channel 78 and is oriented to direct fluid tangentially into the outer channel as shown. With this configuration, fluid moves around the outer channel and enters the impeller chamber in a generally tangential direction as indicated by the arrows in FIG. 7.
  • the stirrer shaft 54 of the anchor agitator 51 rests on its tapered end in a corresponding depression in the bottom of the drive housing 70 such that the anchor agitator is rotatable within the reactor as described above.
  • An array of arcuate vanes 72 project outwardly from the stirrer shaft 54 into the impeller chamber 75 and together form an impeller.
  • FIGS. 8 and 9 illustrate an alternate embodiment of a UV reactor usable to carry out the methodology of the present invention.
  • An elongated UV lamp 81 is surrounded by a UV transparent (preferably quartz) spiral wound flow tube 82 defining a plurality of individual windings 86 .
  • the spiral wound tube 82 terminates at its bottom end in an inlet port 83 that communicates with the bottom end of the tube 82 and at its top end in an outlet port 84 that communicates with the top end of the tube 82 .
  • fluid to be treated is pumped into the inlet port 83 and thence moves through the spiral wound tube 82 around and around the UV lamp 81 , where it is exposed to UV radiation from the lamp.
  • the windings 86 of the tube 82 are formed with a generally D-shaped cross section having a generally rectilinear or flat surface adjacent the UV lamp and a curved outer surface.
  • circulating secondary flows 88 also known as Dean vortices
  • the circulating secondary flows 88 generally are oriented transversely with respect to and are superimposed on the primary flow, and thus are oriented generally transversely with respect to the UV lamp 81 .
  • the circulating secondary flows carry the fluid toward and away from the UV source according to the methodology of the invention with the many benefits described above.
  • an advantage to the reactor configuration of FIGS. 8 and 9 is that it contains no moving parts or drive mechanisms.
  • the characteristics of the primary and secondary flows 87 and 88 respectively, and thus the UV radiation dosage experienced by the fluid, may be controlled by controlling, where feasible, the viscosity of the fluid, the dimensions of the spiral wound tube 82 , and the flow rate of the fluid through the tube.
  • FIGS. 10 and 11 illustrate a UV reactor configuration similar to that of FIGS. 8 and 9, but with the spiral wound flow tube of the reactor having a generally rectangular rather than a D-shaped cross section.
  • the elongated UV lamp 91 is disposed in and surrounded by a spiral wound quartz tube 92 defining a plurality of individual windings 93 .
  • An inlet port 94 communicates with the flow tube 92 at its bottom end and an outlet port 96 communicates with the flow tube 92 at its top end. Fluid to be treated is pumped into the inlet port and moves through the spiral wound tube 92 and thus in a spiral pattern along the surface of the UV lamp in the direction of a primary flow 97 (FIG. 11), and is exposed to UV radiation.
  • the surface tension, friction, and path length gradients within the tube 92 combine to create Dean vortices that manifest themselves as circulating secondary flows 98 superimposed on the primary flow 97 .
  • the circulating secondary flows 98 are oriented substantially transversely relative to the UV lamp and thus carry the fluid toward and away from the lamp according to the methodology of the invention and with the aforementioned benefits thereof.
  • radiation dosage is controllable by controlling fluid characteristics, lamp intensity, and flow rate through the reactor.
  • FIGS. 12 and 13 illustrate still another UV reactor configuration usable to carry out the methodology of the present invention.
  • the reactor 100 includes an elongated UV lamp 101 disposed within a tubular quartz (or other UV transparent material) inner tube 102 .
  • An outer housing 103 surrounds the quartz tube 102 and, in conjunction therewith, defines a reaction chamber 102 extending along the length of the UV lamp 101 .
  • the housing 103 is capped at its top end by a head cap 106 and at its bottom end with a base cap 108 , each of which is sealed to the housing 103 and quartz tube 102 with appropriate O-ring seals 107 .
  • the inner surface of the housing 103 is machined to define a generally helical channel 109 that spirals continuously around the quartz tube 102 from the bottom of the reactor to the top.
  • the helical channel approaches but does not engage the quartz tube 102 and thus defines a series of relatively narrow passages 111 between each turn of the helical channel and the quartz tube 102 .
  • An inlet port 112 communicates with the reaction chamber 104 at the bottom of the reactor and an outlet port 113 communicates with the reaction chamber 104 at the top of the reactor.
  • fluid to be treated is pumped into the reactor through the inlet port and flows generally around the helical channel and along the surface of the UV lamp in a primary flow 114 .
  • This motion of the primary flow generates circulating secondary flows 116 in the form of Dean vortices as a result of fluid dynamical interactions within the D-shaped channel.
  • the circulating secondary flows 116 are superimposed on the primary flow 114 and carry the fluid toward and away from UV source according to the methodology of the present invention.
  • the spaces 111 permit a small volume of the fluid to flow longitudinally along the length of the reactor in a free jet flow 116 (FIG. 13).
  • the fluid in the free jet flow 116 is directed almost perpendicularly onto the spiraling primary flow 114 .
  • the interaction between the two flows causes an enhancement of the circulating motion of the secondary flows 116 as a result of the fluid dynamical forces generated by the interacting flows.
  • This leads to an improved and more even irradiation of the fluid as it moves through the reactor.
  • UV irradiation dosage can be adjusted and controlled by controlling the dimensions of the helical channel, the size of the spaces 111 , the viscosity of the fluid, the intensity of the lamp 101 and the fluid flow rates through the reactor.
  • FIGS. 14 and 15 illustrate yet another embodiment of a UV reactor usable to carry out the methodology of the present invention.
  • the reactor 119 is similar in some respects to the reactor of FIGS. 12 and 13 and includes an elongated UV lamp 121 surrounded by a quartz tube 122 .
  • An outer housing 123 surrounds the quartz tube 122 and in conjunction therewith defines a reaction chamber 124 that extends along the length of the UV lamp 122 .
  • the housing is capped at its top end by a head cap 126 and its bottom end by a base cap 127 , each of which is sealed to the housing and the quartz tube with appropriate O-rings 128 .
  • An inlet port 129 communicates with the reaction chamber at the bottom thereof and an outlet port communicates with the reaction chamber at its top end.
  • the inner wall of the housing 123 is machined or otherwise formed with a series of generally annular channels 132 separated by inward protrusions 135 .
  • the inward protrusions 135 approach but do not touch the quartz tube, thus defining relatively narrow passages 134 between the channels 132 .
  • An array of generally ring-shaped baffles 133 project outwardly from the quartz tube 122 with each baffle being disposed within a corresponding one of the annular channels 132 .
  • fluid to be treated is pumped into the inlet port 129 and moves along the reactor 119 to be extracted at the outlet port 131 .
  • the fluid moves generally in a primary flow 136 along the length of the UV lamp and through the spaces 134 , which confine the flow to a region close to the UV source.
  • the primary flow encounters a baffle 133 , it is diverted toward the outside of the reaction chamber to a location farther from the UV source.
  • the primary flow is again diverted back toward the UV source, and then flows through the next space 134 to the next succeeding channel and baffle combination.
  • the primary flow 136 itself moves repeatedly toward and away from the UV source to obtain benefits of the present invention.
  • the movement and displacement of the primary flow 136 within each chamber creates circulating secondary flows 137 that are oriented generally transversely relative the UV lamp and thus carry the fluid toward and away from the UV source according to principles of the invention.
  • the circulating secondary flows therefore enhance the cross mixing that characterizes the present invention and results in the benefits thereof.
  • FIGS. 16 and 17 illustrate still another embodiment of a UV reactor within which the methodology of the present invention may be carried out.
  • the reactor 140 is similar in many respects to the reactor 119 of FIGS. 14 and 15 and includes an elongated UV lamp 141 disposed within a quartz tube 142 .
  • a housing 143 surrounds the quartz tube 142 and in conjunction therewith defines a reaction chamber 148 .
  • the housing is capped at its top end by a head cap 144 and at its bottom end by a base cap 146 , each of which is sealed to the housing and the quartz tube by appropriate O-rings 147 .
  • a fluid inlet port 153 communicates with the bottom of the reaction chamber 148 and an outlet port 154 communicates with the top of the reaction chamber for ingress and egress respectively of fluid to be treated.
  • the inner wall of the housing 143 is machined or otherwise formed with an array of generally annular chambers 149 separated by respective partitions 151 .
  • the partitions extend toward but do not engage the quartz tube 142 to define relatively narrow passages 152 between the partitions and the quartz tube.
  • fluid to be treated is pumped through the inlet port 153 and moves upwardly along the length of the UV lamp to be extracted through the outlet port 154 .
  • the fluid moves in a primary flow 156 through the passageways 152 and along the length of the UV lamp 142 .
  • the motion of the fluid in the primary flow past successive ones of the annular channels 149 creates vortices that result in circulating secondary flows 157 superimposed on the primary flow within each of the annular chambers.
  • the circulating secondary flows are oriented substantially transversely relative to the UV lamp so that the fluid moves with the secondary flows repeatedly toward and away from the UV lamp according to the methodology of the present invention.
  • the goal of viral inactivation by UVC irradiation is to inactivate high levels of virus without damaging the protein or functionality of interest.
  • Two parameters were found to be critical to achieving this goal; namely protein concentration in the fluid, and UV fluency. Fluency is dependent on the physical configuration of the UV irradiator, since internal flow patterns significantly affect the amount of UV light that is received by any given protein molecule or virus panicle in suspension.
  • the UVC induced potency loss was determined as a function of protein concentration, as shown in FIG. 18, chart A.
  • the UVC-induced potency loss was least at concentrations of 12.5 mg/ml ⁇ 1 proteinase inhibitor, but increased at protein concentrations of 7.0, 5.0 and 4.0 mg/ml. The greatest effect on potency was seen at the lowest protein concentration, 2.5 mg/ml.
  • FIG. 9B the smallest reduction in virus infectivity was observed at the highest ⁇ 1 proteinase inhibitor concentration of 12.5 mg/ml, and the highest level of inactivation was observed at the lowest concentration, namely 2.5 mg/ml. Based on these data, 5 mg/ml of ⁇ 1 proteinase inhibitor was used for UVC inactivation as a compromise between acceptable protein potency and good viral inactivation.
  • Porcine Parvovirus Porcine Parvovirus (PPV), strain Tennessee, a non-enveloped, single-stranded DNA virus was used in these studies as a model for human parvovirus B19. This virus has been shown to be resistant to inactivation by several methods, including pasteurization and dry heat.
  • Virus stocks were prepared by infection of porcine testicle (PT) cells. Virus was propagated by infecting subconfluent monolayers of PT cells at a low multiplicity of infection, adding propagation medium and then incubating the cells at 37° C. in 5% C 0 2 until advanced cytopathology was observed. Virus propagation media consisted of minimum essential medium, Earle's salts supplemented with 7.5% fetal bovine serum and NHG.
  • NHG was added to prevent contamination and provide for the additional media requirements of this cell line and consisted of 0.1 mM nonessential amino acids, 10 mM HEPES (N-[2-Hydroxyethyl]piperazine-N′-[2-ethanesulfonic acid], 0.05 mg/ml gentamicin and fungizone (2.5 mg/ml Amphotericin B).
  • Infected cells were disrupted by freeze-thawing and the cell lysates were stored at about ⁇ 70° C. until used.
  • the virus spike for each experiment was prepared by thawing the virus-infected cell lysate, centrifuging at low speed (4000 ⁇ g) to remove the cell debris and collecting the clarified supernatants.
  • Viral inactivation by UVC was determined by endpoint dilution in 96-well microtiter plates seeded with PT cells and using MEM containing 7.5% FBS and NHG. Virus was diluted using serial half log dilutions of the test sample or positive control in Hank's Balanced Salt Solution (HBSS). Positive controls consisted of the same lot of virus that was used as the virus spike. Unspiked HBSS was used as a negative control. Each dilution was used to inoculate 8 wells of a 96-well microtiter plate. After 7 days incubation at 37° C. in 5% CO 2 , cytopathology was scored.
  • HBSS Hank's Balanced Salt Solution
  • Results were converted into a titer (log median tissue culture infective dose per ml; TCID 50 /ml) by the method of Spearman and Karber (Cavalli-Sfprza, L. Biometrie Grundzuge bio strig-technik-chemistry Statizing [Biometry, the basics of biological and medical statistics], Gustav Fischer Verlag Stuttgart, 1974, p. 171-173.)
  • the processes of the present invention inactivate PPV at a smaller fluency than other viruses, but all were inactivated by at least four orders of magnitude when exposed to fluencies within the range 0.014-9.0 Joules/cm 2 . Also, the smaller the viral genome, typically the smaller the effective fluency value.
  • ⁇ 1 PI protein integrity was assessed by determining the ability of the enzyme to inhibit porcine elastase. Protein integrity was expressed as the percent of the activity before UVC exposure.
  • Pre-formulation IGIV was diluted to 0.8% with water, adjusted to pH 4.2 and spiked to 10% with PPV.
  • IGIV phosphatidylcholine
  • a peristaltic pump calibrated to deliver 100 ml/min.
  • the protein solution was pumped through the device and re-circulated through a stirred reservoir containing the sample.
  • the protein solution was re-circulated though the entire assembly for 5, 10, 15, 30 and 60 minutes, corresponding to fluencies of 2.8, 5.6, 8.4, 16.9 and 33.8 Joules/cm 2 , respectively.
  • fluency was defined as the mean residence time (reactor volume divided by volume flow rate) multiplied by the UV light intensity at the surface of the reaction chamber nearest the UV source (which may be the surface of a quartz sleeve surrounding the UV lamp).
  • ideal plug flow was assumed. As shown in FIG. 19, after 5 minutes of re-circulation, four logs of PPV reduction was observed, and by 30 minutes, over seven logs of inactivation was seen. After 60 minutes of UVC exposure, 95% monomeric IgG remained.
  • Alpha 1 proteinase inhibitor ( ⁇ 1 PI) was diluted to 5 mg/ml in 20 mM Na phosphate, pH 7.0 and 100 mM NaCl and exposed to UVC in the same device as used in example 1. During this experiment, however, the solution was pumped through the device in a single pass at flow rates between 25 and 1200 ml/minutes, resulting in fluencies ranging from 0.19-18 Joules/cm 2 .
  • At least 95% of the initial ⁇ 1 PI activity was observed at fluencies that were less than or equal to 2 Joules/cm 2 . Since the same UV lamp and the same light intensity was used in all of the experiments, this demonstrates that improved hydrodynamic conditions (mixing), i.e. inducing a circulating secondary flow within the primary flow, reduce the total residence time of protein solution in the reactor that is necessary to gain adequate virus inactivation.
  • Graph A shows the result of studies evaluating the inactivation of porcine parvo virus (PPV) in a solution of 5 mg/ml alpha 1 proteinase inhibitor in three different reactor configurations. It can be seen that a threshold of 4-log virus reduction can be achieved at an approximate fluency of 0.7 J/cm 2 in a simple tubular reactor, similar the prior art reactor shown in FIG. 1. Improved hydrodynamic conditions, especially an increase in radial flow components in a reactor with tangential flow characteristics and a reactor with a spiral wound reaction chamber (see FIG. 8) lead to a significant decrease in UV light energy that is necessary to sterilize plasma solutions.
  • PSV porcine parvo virus
  • Graph C shows the result of studies assessing the inactivation of Reo-virus 3 in a solution of 5 mg/ml alpha 1 proteinase inhibitor in the UV reactor with a spiral wound reaction chamber. It can be seen from this that Reo inactivation increases with increasing fluency and reaches a 4-log reduction at approximately 0.15 J/cm 2 . At the same time protein activity is not impacted, but it declines at fluencies above 0.15 J/cm 2 . The fluency value of 0.15 J/cm 2 corresponds to a flow rate of 1000 ml/min. As noted in Fig. YYY mixing apparently approaches a limit at flow rates above 1000 ml/min in this device and plateaus.
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